7. Which of the following is a ratio response? *EthnicityIQ TestClass positionTime

The question seems to be asking for a response that is a ratio. A ratio response is a type of variable that can be measured on an interval scale and has a meaningful zero point. This means that you can say that one measure is "twice as much" as another.

Looking at the options:

1. Ethnicity: This is a nominal variable, not a ratio, because it categorizes individuals into groups but does not rank or quantify them.

2. IQ Test: This is an interval variable. While it does rank individuals (someone with a higher IQ score is considered more intelligent), it does not have a true zero point (a score of 0 does not mean absence of intelligence).

3. Class position: This is an ordinal variable. It ranks individuals (someone in a higher class position is considered to have a higher status), but the differences between ranks are not quantifiable.

4. Time: This is a ratio variable. It can be measured on an interval scale (the difference between 10 minutes and 20 minutes is the same as the difference between 20 minutes and 30 minutes), and it has a true zero point (0 minutes means no time has passed).

So, the answer to the question "Which of the following is a